Bob Nold gardens in Lakeland, Colorado. He is a member of numerous plant societies, including the Alpine Garden Society and the North American Rock Garden Society (who honored him with its Award for Service), and a regular writer for the Rocky Mountain Chapter of the North American Rock Garden Society and the Colorado Gardener. His monograph on the genus Penstemon (Timber Press, 1999) was honored as an Outstanding Academic Book by Choice magazine. His other books include Columbines and High and Dry: Gardening with Cold-Hardy Dryland Plants.